File indexing completed on 2024-05-12 06:02:23

 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Date
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @version    $Id$
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 /**
  * @category   Zend
  * @package    Zend_Date
  * @subpackage Zend_Date_DateObject
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Date_DateObject {
 
     /**
      * UNIX Timestamp
      */
     private   $_unixTimestamp;
     protected static $_cache         = null;
     protected static $_cacheTags     = false;
     protected static $_defaultOffset = 0;
 
     /**
      * active timezone
      */
     private   $_timezone    = 'UTC';
     private   $_offset      = 0;
     private   $_syncronised = 0;
 
     // turn off DST correction if UTC or GMT
     protected $_dst         = true;
 
     /**
      * Table of Monthdays
      */
     private static $_monthTable = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
 
     /**
      * Table of Years
      */
     private static $_yearTable = array(
         1970 => 0,            1960 => -315619200,   1950 => -631152000,
         1940 => -946771200,   1930 => -1262304000,  1920 => -1577923200,
         1910 => -1893456000,  1900 => -2208988800,  1890 => -2524521600,
         1880 => -2840140800,  1870 => -3155673600,  1860 => -3471292800,
         1850 => -3786825600,  1840 => -4102444800,  1830 => -4417977600,
         1820 => -4733596800,  1810 => -5049129600,  1800 => -5364662400,
         1790 => -5680195200,  1780 => -5995814400,  1770 => -6311347200,
         1760 => -6626966400,  1750 => -6942499200,  1740 => -7258118400,
         1730 => -7573651200,  1720 => -7889270400,  1710 => -8204803200,
         1700 => -8520336000,  1690 => -8835868800,  1680 => -9151488000,
         1670 => -9467020800,  1660 => -9782640000,  1650 => -10098172800,
         1640 => -10413792000, 1630 => -10729324800, 1620 => -11044944000,
         1610 => -11360476800, 1600 => -11676096000);
 
     /**
      * Set this object to have a new UNIX timestamp.
      *
      * @param  string|integer  $timestamp  OPTIONAL timestamp; defaults to local time using time()
      * @return string|integer  old timestamp
      * @throws Zend_Date_Exception
      */
     protected function setUnixTimestamp($timestamp = null)
     {
         $old = $this->_unixTimestamp;
 
         if (is_numeric($timestamp)) {
             $this->_unixTimestamp = $timestamp;
         } else if ($timestamp === null) {
             $this->_unixTimestamp = time();
         } else {
             // require_once 'Zend/Date/Exception.php';
             throw new Zend_Date_Exception('\'' . $timestamp . '\' is not a valid UNIX timestamp', 0, null, $timestamp);
         }
 
         return $old;
     }
 
     /**
      * Returns this object's UNIX timestamp
      * A timestamp greater then the integer range will be returned as string
      * This function does not return the timestamp as object. Use copy() instead.
      *
      * @return  integer|string  timestamp
      */
     protected function getUnixTimestamp()
     {
         if ($this->_unixTimestamp === intval($this->_unixTimestamp)) {
             return (int) $this->_unixTimestamp;
         } else {
             return (string) $this->_unixTimestamp;
         }
     }
 
     /**
      * Internal function.
      * Returns time().  This method exists to allow unit tests to work-around methods that might otherwise
      * be hard-coded to use time().  For example, this makes it possible to test isYesterday() in Date.php.
      *
      * @param   integer  $sync      OPTIONAL time syncronisation value
      * @return  integer  timestamp
      */
     protected function _getTime($sync = null)
     {
         if ($sync !== null) {
             $this->_syncronised = round($sync);
         }
         return (time() + $this->_syncronised);
     }
 
     /**
      * Internal mktime function used by Zend_Date.
      * The timestamp returned by mktime() can exceed the precision of traditional UNIX timestamps,
      * by allowing PHP to auto-convert to using a float value.
      *
      * Returns a timestamp relative to 1970/01/01 00:00:00 GMT/UTC.
      * DST (Summer/Winter) is depriciated since php 5.1.0.
      * Year has to be 4 digits otherwise it would be recognised as
      * year 70 AD instead of 1970 AD as expected !!
      *
      * @param  integer  $hour
      * @param  integer  $minute
      * @param  integer  $second
      * @param  integer  $month
      * @param  integer  $day
      * @param  integer  $year
      * @param  boolean  $gmt     OPTIONAL true = other arguments are for UTC time, false = arguments are for local time/date
      * @return  integer|float  timestamp (number of seconds elapsed relative to 1970/01/01 00:00:00 GMT/UTC)
      */
     protected function mktime($hour, $minute, $second, $month, $day, $year, $gmt = false)
     {
         // complete date but in 32bit timestamp - use PHP internal
         if ((1901 < $year) and ($year < 2038)) {
 
             $oldzone = @date_default_timezone_get();
             // Timezone also includes DST settings, therefor substracting the GMT offset is not enough
             // We have to set the correct timezone to get the right value
             if (($this->_timezone != $oldzone) and ($gmt === false)) {
                 date_default_timezone_set($this->_timezone);
             }
             $result = ($gmt) ? @gmmktime($hour, $minute, $second, $month, $day, $year)
                              :   @mktime($hour, $minute, $second, $month, $day, $year);
             date_default_timezone_set($oldzone);
 
             return $result;
         }
 
         if ($gmt !== true) {
             $second += $this->_offset;
         }
 
         if (isset(self::$_cache)) {
             $id = strtr('Zend_DateObject_mkTime_' . $this->_offset . '_' . $year.$month.$day.'_'.$hour.$minute.$second . '_'.(int)$gmt, '-','_');
             if ($result = self::$_cache->load($id)) {
                 return unserialize($result);
             }
         }
 
         // date to integer
         $day   = intval($day);
         $month = intval($month);
         $year  = intval($year);
 
         // correct months > 12 and months < 1
         if ($month > 12) {
             $overlap = floor($month / 12);
             $year   += $overlap;
             $month  -= $overlap * 12;
         } else {
             $overlap = ceil((1 - $month) / 12);
             $year   -= $overlap;
             $month  += $overlap * 12;
         }
 
         $date = 0;
         if ($year >= 1970) {
 
             // Date is after UNIX epoch
             // go through leapyears
             // add months from latest given year
             for ($count = 1970; $count <= $year; $count++) {
 
                 $leapyear = self::isYearLeapYear($count);
                 if ($count < $year) {
 
                     $date += 365;
                     if ($leapyear === true) {
                         $date++;
                     }
 
                 } else {
 
                     for ($mcount = 0; $mcount < ($month - 1); $mcount++) {
                         $date += self::$_monthTable[$mcount];
                         if (($leapyear === true) and ($mcount == 1)) {
                             $date++;
                         }
 
                     }
                 }
             }
 
             $date += $day - 1;
             $date = (($date * 86400) + ($hour * 3600) + ($minute * 60) + $second);
         } else {
 
             // Date is before UNIX epoch
             // go through leapyears
             // add months from latest given year
             for ($count = 1969; $count >= $year; $count--) {
 
                 $leapyear = self::isYearLeapYear($count);
                 if ($count > $year)
                 {
                     $date += 365;
                     if ($leapyear === true)
                         $date++;
                 } else {
 
                     for ($mcount = 11; $mcount > ($month - 1); $mcount--) {
                         $date += self::$_monthTable[$mcount];
                         if (($leapyear === true) and ($mcount == 2)) {
                             $date++;
                         }
 
                     }
                 }
             }
 
             $date += (self::$_monthTable[$month - 1] - $day);
             $date = -(($date * 86400) + (86400 - (($hour * 3600) + ($minute * 60) + $second)));
 
             // gregorian correction for 5.Oct.1582
             if ($date < -12220185600) {
                 $date += 864000;
             } else if ($date < -12219321600) {
                 $date  = -12219321600;
             }
         }
 
         if (isset(self::$_cache)) {
             if (self::$_cacheTags) {
                 self::$_cache->save( serialize($date), $id, array('Zend_Date'));
             } else {
                 self::$_cache->save( serialize($date), $id);
             }
         }
 
         return $date;
     }
 
     /**
      * Returns true, if given $year is a leap year.
      *
      * @param  integer  $year
      * @return boolean  true, if year is leap year
      */
     protected static function isYearLeapYear($year)
     {
         // all leapyears can be divided through 4
         if (($year % 4) != 0) {
             return false;
         }
 
         // all leapyears can be divided through 400
         if ($year % 400 == 0) {
             return true;
         } else if (($year > 1582) and ($year % 100 == 0)) {
             return false;
         }
 
         return true;
     }
 
     /**
      * Internal mktime function used by Zend_Date for handling 64bit timestamps.
      *
      * Returns a formatted date for a given timestamp.
      *
      * @param  string   $format     format for output
      * @param  mixed    $timestamp
      * @param  boolean  $gmt        OPTIONAL true = other arguments are for UTC time, false = arguments are for local time/date
      * @return string
      */
     protected function date($format, $timestamp = null, $gmt = false)
     {
         $oldzone = @date_default_timezone_get();
         if ($this->_timezone != $oldzone) {
             date_default_timezone_set($this->_timezone);
         }
 
         if ($timestamp === null) {
             $result = ($gmt) ? @gmdate($format) : @date($format);
             date_default_timezone_set($oldzone);
             return $result;
         }
 
         if (abs($timestamp) <= 0x7FFFFFFF) {
             // See ZF-11992
             // "o" will sometimes resolve to the previous year (see 
             // http://php.net/date ; it's part of the ISO 8601 
             // standard). However, this is not desired, so replacing 
             // all occurrences of "o" not preceded by a backslash 
             // with "Y"
             $format = preg_replace('/(?<!\\\\)o/', 'Y', $format);
             $result = ($gmt) ? @gmdate($format, $timestamp) : @date($format, $timestamp);
             date_default_timezone_set($oldzone);
             return $result;
         }
 
         $jump      = false;
         $origstamp = $timestamp;
         if (isset(self::$_cache)) {
             $idstamp = strtr('Zend_DateObject_date_' . $this->_offset . '_'. $timestamp . '_'.(int)$gmt, '-','_');
             if ($result2 = self::$_cache->load($idstamp)) {
                 $timestamp = unserialize($result2);
                 $jump = true;
             }
         }
 
         // check on false or null alone fails
         if (empty($gmt) and empty($jump)) {
             $tempstamp = $timestamp;
             if ($tempstamp > 0) {
                 while (abs($tempstamp) > 0x7FFFFFFF) {
                     $tempstamp -= (86400 * 23376);
                 }
 
                 $dst = date("I", $tempstamp);
                 if ($dst === 1) {
                     $timestamp += 3600;
                 }
 
                 $temp       = date('Z', $tempstamp);
                 $timestamp += $temp;
             }
 
             if (isset(self::$_cache)) {
                 if (self::$_cacheTags) {
                     self::$_cache->save( serialize($timestamp), $idstamp, array('Zend_Date'));
                 } else {
                     self::$_cache->save( serialize($timestamp), $idstamp);
                 }
             }
         }
 
         if (($timestamp < 0) and ($gmt !== true)) {
             $timestamp -= $this->_offset;
         }
 
         date_default_timezone_set($oldzone);
         $date   = $this->getDateParts($timestamp, true);
         $length = strlen($format);
         $output = '';
 
         for ($i = 0; $i < $length; $i++) {
             switch($format[$i]) {
                 // day formats
                 case 'd':  // day of month, 2 digits, with leading zero, 01 - 31
                     $output .= (($date['mday'] < 10) ? '0' . $date['mday'] : $date['mday']);
                     break;
 
                 case 'D':  // day of week, 3 letters, Mon - Sun
                     $output .= date('D', 86400 * (3 + self::dayOfWeek($date['year'], $date['mon'], $date['mday'])));
                     break;
 
                 case 'j':  // day of month, without leading zero, 1 - 31
                     $output .= $date['mday'];
                     break;
 
                 case 'l':  // day of week, full string name, Sunday - Saturday
                     $output .= date('l', 86400 * (3 + self::dayOfWeek($date['year'], $date['mon'], $date['mday'])));
                     break;
 
                 case 'N':  // ISO 8601 numeric day of week, 1 - 7
                     $day = self::dayOfWeek($date['year'], $date['mon'], $date['mday']);
                     if ($day == 0) {
                         $day = 7;
                     }
                     $output .= $day;
                     break;
 
                 case 'S':  // english suffix for day of month, st nd rd th
                     if (($date['mday'] % 10) == 1) {
                         $output .= 'st';
                     } else if ((($date['mday'] % 10) == 2) and ($date['mday'] != 12)) {
                         $output .= 'nd';
                     } else if (($date['mday'] % 10) == 3) {
                         $output .= 'rd';
                     } else {
                         $output .= 'th';
                     }
                     break;
 
                 case 'w':  // numeric day of week, 0 - 6
                     $output .= self::dayOfWeek($date['year'], $date['mon'], $date['mday']);
                     break;
 
                 case 'z':  // day of year, 0 - 365
                     $output .= $date['yday'];
                     break;
 
 
                 // week formats
                 case 'W':  // ISO 8601, week number of year
                     $output .= $this->weekNumber($date['year'], $date['mon'], $date['mday']);
                     break;
 
 
                 // month formats
                 case 'F':  // string month name, january - december
                     $output .= date('F', mktime(0, 0, 0, $date['mon'], 2, 1971));
                     break;
 
                 case 'm':  // number of month, with leading zeros, 01 - 12
                     $output .= (($date['mon'] < 10) ? '0' . $date['mon'] : $date['mon']);
                     break;
 
                 case 'M':  // 3 letter month name, Jan - Dec
                     $output .= date('M',mktime(0, 0, 0, $date['mon'], 2, 1971));
                     break;
 
                 case 'n':  // number of month, without leading zeros, 1 - 12
                     $output .= $date['mon'];
                     break;
 
                 case 't':  // number of day in month
                     $output .= self::$_monthTable[$date['mon'] - 1];
                     break;
 
 
                 // year formats
                 case 'L':  // is leap year ?
                     $output .= (self::isYearLeapYear($date['year'])) ? '1' : '0';
                     break;
 
                 case 'o':  // ISO 8601 year number
                     $week = $this->weekNumber($date['year'], $date['mon'], $date['mday']);
                     if (($week > 50) and ($date['mon'] == 1)) {
                         $output .= ($date['year'] - 1);
                     } else {
                         $output .= $date['year'];
                     }
                     break;
 
                 case 'Y':  // year number, 4 digits
                     $output .= $date['year'];
                     break;
 
                 case 'y':  // year number, 2 digits
                     $output .= substr($date['year'], strlen($date['year']) - 2, 2);
                     break;
 
 
                 // time formats
                 case 'a':  // lower case am/pm
                     $output .= (($date['hours'] >= 12) ? 'pm' : 'am');
                     break;
 
                 case 'A':  // upper case am/pm
                     $output .= (($date['hours'] >= 12) ? 'PM' : 'AM');
                     break;
 
                 case 'B':  // swatch internet time
                     $dayseconds = ($date['hours'] * 3600) + ($date['minutes'] * 60) + $date['seconds'];
                     if ($gmt === true) {
                         $dayseconds += 3600;
                     }
                     $output .= (int) (($dayseconds % 86400) / 86.4);
                     break;
 
                 case 'g':  // hours without leading zeros, 12h format
                     if ($date['hours'] > 12) {
                         $hour = $date['hours'] - 12;
                     } else {
                         if ($date['hours'] == 0) {
                             $hour = '12';
                         } else {
                             $hour = $date['hours'];
                         }
                     }
                     $output .= $hour;
                     break;
 
                 case 'G':  // hours without leading zeros, 24h format
                     $output .= $date['hours'];
                     break;
 
                 case 'h':  // hours with leading zeros, 12h format
                     if ($date['hours'] > 12) {
                         $hour = $date['hours'] - 12;
                     } else {
                         if ($date['hours'] == 0) {
                             $hour = '12';
                         } else {
                             $hour = $date['hours'];
                         }
                     }
                     $output .= (($hour < 10) ? '0'.$hour : $hour);
                     break;
 
                 case 'H':  // hours with leading zeros, 24h format
                     $output .= (($date['hours'] < 10) ? '0' . $date['hours'] : $date['hours']);
                     break;
 
                 case 'i':  // minutes with leading zeros
                     $output .= (($date['minutes'] < 10) ? '0' . $date['minutes'] : $date['minutes']);
                     break;
 
                 case 's':  // seconds with leading zeros
                     $output .= (($date['seconds'] < 10) ? '0' . $date['seconds'] : $date['seconds']);
                     break;
 
 
                 // timezone formats
                 case 'e':  // timezone identifier
                     if ($gmt === true) {
                         $output .= gmdate('e', mktime($date['hours'], $date['minutes'], $date['seconds'],
                                                       $date['mon'], $date['mday'], 2000));
                     } else {
                         $output .=   date('e', mktime($date['hours'], $date['minutes'], $date['seconds'],
                                                       $date['mon'], $date['mday'], 2000));
                     }
                     break;
 
                 case 'I':  // daylight saving time or not
                     if ($gmt === true) {
                         $output .= gmdate('I', mktime($date['hours'], $date['minutes'], $date['seconds'],
                                                       $date['mon'], $date['mday'], 2000));
                     } else {
                         $output .=   date('I', mktime($date['hours'], $date['minutes'], $date['seconds'],
                                                       $date['mon'], $date['mday'], 2000));
                     }
                     break;
 
                 case 'O':  // difference to GMT in hours
                     $gmtstr = ($gmt === true) ? 0 : $this->getGmtOffset();
                     $output .= sprintf('%s%04d', ($gmtstr <= 0) ? '+' : '-', abs($gmtstr) / 36);
                     break;
 
                 case 'P':  // difference to GMT with colon
                     $gmtstr = ($gmt === true) ? 0 : $this->getGmtOffset();
                     $gmtstr = sprintf('%s%04d', ($gmtstr <= 0) ? '+' : '-', abs($gmtstr) / 36);
                     $output = $output . substr($gmtstr, 0, 3) . ':' . substr($gmtstr, 3);
                     break;
 
                 case 'T':  // timezone settings
                     if ($gmt === true) {
                         $output .= gmdate('T', mktime($date['hours'], $date['minutes'], $date['seconds'],
                                                       $date['mon'], $date['mday'], 2000));
                     } else {
                         $output .=   date('T', mktime($date['hours'], $date['minutes'], $date['seconds'],
                                                       $date['mon'], $date['mday'], 2000));
                     }
                     break;
 
                 case 'Z':  // timezone offset in seconds
                     $output .= ($gmt === true) ? 0 : -$this->getGmtOffset();
                     break;
 
 
                 // complete time formats
                 case 'c':  // ISO 8601 date format
                     $difference = $this->getGmtOffset();
                     $difference = sprintf('%s%04d', ($difference <= 0) ? '+' : '-', abs($difference) / 36);
                     $difference = substr($difference, 0, 3) . ':' . substr($difference, 3);
                     $output .= $date['year'] . '-'
                              . (($date['mon']     < 10) ? '0' . $date['mon']     : $date['mon'])     . '-'
                              . (($date['mday']    < 10) ? '0' . $date['mday']    : $date['mday'])    . 'T'
                              . (($date['hours']   < 10) ? '0' . $date['hours']   : $date['hours'])   . ':'
                              . (($date['minutes'] < 10) ? '0' . $date['minutes'] : $date['minutes']) . ':'
                              . (($date['seconds'] < 10) ? '0' . $date['seconds'] : $date['seconds'])
                              . $difference;
                     break;
 
                 case 'r':  // RFC 2822 date format
                     $difference = $this->getGmtOffset();
                     $difference = sprintf('%s%04d', ($difference <= 0) ? '+' : '-', abs($difference) / 36);
                     $output .= gmdate('D', 86400 * (3 + self::dayOfWeek($date['year'], $date['mon'], $date['mday']))) . ', '
                              . (($date['mday']    < 10) ? '0' . $date['mday']    : $date['mday'])    . ' '
                              . date('M', mktime(0, 0, 0, $date['mon'], 2, 1971)) . ' '
                              . $date['year'] . ' '
                              . (($date['hours']   < 10) ? '0' . $date['hours']   : $date['hours'])   . ':'
                              . (($date['minutes'] < 10) ? '0' . $date['minutes'] : $date['minutes']) . ':'
                              . (($date['seconds'] < 10) ? '0' . $date['seconds'] : $date['seconds']) . ' '
                              . $difference;
                     break;
 
                 case 'U':  // Unix timestamp
                     $output .= $origstamp;
                     break;
 
 
                 // special formats
                 case "\\":  // next letter to print with no format
                     $i++;
                     if ($i < $length) {
                         $output .= $format[$i];
                     }
                     break;
 
                 default:  // letter is no format so add it direct
                     $output .= $format[$i];
                     break;
             }
         }
 
         return (string) $output;
     }
 
     /**
      * Returns the day of week for a Gregorian calendar date.
      * 0 = sunday, 6 = saturday
      *
      * @param  integer  $year
      * @param  integer  $month
      * @param  integer  $day
      * @return integer  dayOfWeek
      */
     protected static function dayOfWeek($year, $month, $day)
     {
         if ((1901 < $year) and ($year < 2038)) {
             return (int) date('w', mktime(0, 0, 0, $month, $day, $year));
         }
 
         // gregorian correction
         $correction = 0;
         if (($year < 1582) or (($year == 1582) and (($month < 10) or (($month == 10) && ($day < 15))))) {
             $correction = 3;
         }
 
         if ($month > 2) {
             $month -= 2;
         } else {
             $month += 10;
             $year--;
         }
 
         $day  = floor((13 * $month - 1) / 5) + $day + ($year % 100) + floor(($year % 100) / 4);
         $day += floor(($year / 100) / 4) - 2 * floor($year / 100) + 77 + $correction;
 
         return (int) ($day - 7 * floor($day / 7));
     }
 
     /**
      * Internal getDateParts function for handling 64bit timestamps, similar to:
      * http://www.php.net/getdate
      *
      * Returns an array of date parts for $timestamp, relative to 1970/01/01 00:00:00 GMT/UTC.
      *
      * $fast specifies ALL date parts should be returned (slower)
      * Default is false, and excludes $dayofweek, weekday, month and timestamp from parts returned.
      *
      * @param   mixed    $timestamp
      * @param   boolean  $fast   OPTIONAL defaults to fast (false), resulting in fewer date parts
      * @return  array
      */
     protected function getDateParts($timestamp = null, $fast = null)
     {
 
         // actual timestamp
         if (!is_numeric($timestamp)) {
             return getdate();
         }
 
         // 32bit timestamp
         if (abs($timestamp) <= 0x7FFFFFFF) {
             return @getdate((int) $timestamp);
         }
 
         if (isset(self::$_cache)) {
             $id = strtr('Zend_DateObject_getDateParts_' . $timestamp.'_'.(int)$fast, '-','_');
             if ($result = self::$_cache->load($id)) {
                 return unserialize($result);
             }
         }
 
         $otimestamp = $timestamp;
         $numday = 0;
         $month = 0;
         // gregorian correction
         if ($timestamp < -12219321600) {
             $timestamp -= 864000;
         }
 
         // timestamp lower 0
         if ($timestamp < 0) {
             $sec = 0;
             $act = 1970;
 
             // iterate through 10 years table, increasing speed
             foreach(self::$_yearTable as $year => $seconds) {
                 if ($timestamp >= $seconds) {
                     $i = $act;
                     break;
                 }
                 $sec = $seconds;
                 $act = $year;
             }
 
             $timestamp -= $sec;
             if (!isset($i)) {
                 $i = $act;
             }
 
             // iterate the max last 10 years
             do {
                 --$i;
                 $day = $timestamp;
 
                 $timestamp += 31536000;
                 $leapyear = self::isYearLeapYear($i);
                 if ($leapyear === true) {
                     $timestamp += 86400;
                 }
 
                 if ($timestamp >= 0) {
                     $year = $i;
                     break;
                 }
             } while ($timestamp < 0);
 
             $secondsPerYear = 86400 * ($leapyear ? 366 : 365) + $day;
 
             $timestamp = $day;
             // iterate through months
             for ($i = 12; --$i >= 0;) {
                 $day = $timestamp;
 
                 $timestamp += self::$_monthTable[$i] * 86400;
                 if (($leapyear === true) and ($i == 1)) {
                     $timestamp += 86400;
                 }
 
                 if ($timestamp >= 0) {
                     $month  = $i;
                     $numday = self::$_monthTable[$i];
                     if (($leapyear === true) and ($i == 1)) {
                         ++$numday;
                     }
                     break;
                 }
             }
 
             $timestamp  = $day;
             $numberdays = $numday + ceil(($timestamp + 1) / 86400);
 
             $timestamp += ($numday - $numberdays + 1) * 86400;
             $hours      = floor($timestamp / 3600);
         } else {
 
             // iterate through years
             for ($i = 1970;;$i++) {
                 $day = $timestamp;
 
                 $timestamp -= 31536000;
                 $leapyear = self::isYearLeapYear($i);
                 if ($leapyear === true) {
                     $timestamp -= 86400;
                 }
 
                 if ($timestamp < 0) {
                     $year = $i;
                     break;
                 }
             }
 
             $secondsPerYear = $day;
 
             $timestamp = $day;
             // iterate through months
             for ($i = 0; $i <= 11; $i++) {
                 $day = $timestamp;
                 $timestamp -= self::$_monthTable[$i] * 86400;
 
                 if (($leapyear === true) and ($i == 1)) {
                     $timestamp -= 86400;
                 }
 
                 if ($timestamp < 0) {
                     $month  = $i;
                     $numday = self::$_monthTable[$i];
                     if (($leapyear === true) and ($i == 1)) {
                         ++$numday;
                     }
                     break;
                 }
             }
 
             $timestamp  = $day;
             $numberdays = ceil(($timestamp + 1) / 86400);
             $timestamp  = $timestamp - ($numberdays - 1) * 86400;
             $hours = floor($timestamp / 3600);
         }
 
         $timestamp -= $hours * 3600;
 
         $month  += 1;
         $minutes = floor($timestamp / 60);
         $seconds = $timestamp - $minutes * 60;
 
         if ($fast === true) {
             $array = array(
                 'seconds' => $seconds,
                 'minutes' => $minutes,
                 'hours'   => $hours,
                 'mday'    => $numberdays,
                 'mon'     => $month,
                 'year'    => $year,
                 'yday'    => floor($secondsPerYear / 86400),
             );
         } else {
 
             $dayofweek = self::dayOfWeek($year, $month, $numberdays);
             $array = array(
                     'seconds' => $seconds,
                     'minutes' => $minutes,
                     'hours'   => $hours,
                     'mday'    => $numberdays,
                     'wday'    => $dayofweek,
                     'mon'     => $month,
                     'year'    => $year,
                     'yday'    => floor($secondsPerYear / 86400),
                     'weekday' => gmdate('l', 86400 * (3 + $dayofweek)),
                     'month'   => gmdate('F', mktime(0, 0, 0, $month, 1, 1971)),
                     0         => $otimestamp
             );
         }
 
         if (isset(self::$_cache)) {
             if (self::$_cacheTags) {
                 self::$_cache->save( serialize($array), $id, array('Zend_Date'));
             } else {
                 self::$_cache->save( serialize($array), $id);
             }
         }
 
         return $array;
     }
 
     /**
      * Internal getWeekNumber function for handling 64bit timestamps
      *
      * Returns the ISO 8601 week number of a given date
      *
      * @param  integer  $year
      * @param  integer  $month
      * @param  integer  $day
      * @return integer
      */
     protected function weekNumber($year, $month, $day)
     {
         if ((1901 < $year) and ($year < 2038)) {
             return (int) date('W', mktime(0, 0, 0, $month, $day, $year));
         }
 
         $dayofweek = self::dayOfWeek($year, $month, $day);
         $firstday  = self::dayOfWeek($year, 1, 1);
         if (($month == 1) and (($firstday < 1) or ($firstday > 4)) and ($day < 4)) {
             $firstday  = self::dayOfWeek($year - 1, 1, 1);
             $month     = 12;
             $day       = 31;
 
         } else if (($month == 12) and ((self::dayOfWeek($year + 1, 1, 1) < 5) and
                    (self::dayOfWeek($year + 1, 1, 1) > 0))) {
             return 1;
         }
 
         return intval (((self::dayOfWeek($year, 1, 1) < 5) and (self::dayOfWeek($year, 1, 1) > 0)) +
                4 * ($month - 1) + (2 * ($month - 1) + ($day - 1) + $firstday - $dayofweek + 6) * 36 / 256);
     }
 
     /**
      * Internal _range function
      * Sets the value $a to be in the range of [0, $b]
      *
      * @param float $a - value to correct
      * @param float $b - maximum range to set
      */
     private function _range($a, $b) {
         while ($a < 0) {
             $a += $b;
         }
         while ($a >= $b) {
             $a -= $b;
         }
         return $a;
     }
 
     /**
      * Calculates the sunrise or sunset based on a location
      *
      * @param  array  $location  Location for calculation MUST include 'latitude', 'longitude', 'horizon'
      * @param  bool   $horizon   true: sunrise; false: sunset
      * @return mixed  - false: midnight sun, integer:
      */
     protected function calcSun($location, $horizon, $rise = false)
     {
         // timestamp within 32bit
         if (abs($this->_unixTimestamp) <= 0x7FFFFFFF) {
             if ($rise === false) {
                 return date_sunset($this->_unixTimestamp, SUNFUNCS_RET_TIMESTAMP, $location['latitude'],
                                    $location['longitude'], 90 + $horizon, $this->getGmtOffset() / 3600);
             }
             return date_sunrise($this->_unixTimestamp, SUNFUNCS_RET_TIMESTAMP, $location['latitude'],
                                 $location['longitude'], 90 + $horizon, $this->getGmtOffset() / 3600);
         }
 
         // self calculation - timestamp bigger than 32bit
         // fix circle values
         $quarterCircle      = 0.5 * M_PI;
         $halfCircle         =       M_PI;
         $threeQuarterCircle = 1.5 * M_PI;
         $fullCircle         = 2   * M_PI;
 
         // radiant conversion for coordinates
         $radLatitude  = $location['latitude']   * $halfCircle / 180;
         $radLongitude = $location['longitude']  * $halfCircle / 180;
 
         // get solar coordinates
         $tmpRise       = $rise ? $quarterCircle : $threeQuarterCircle;
         $radDay        = $this->date('z',$this->_unixTimestamp) + ($tmpRise - $radLongitude) / $fullCircle;
 
         // solar anomoly and longitude
         $solAnomoly    = $radDay * 0.017202 - 0.0574039;
         $solLongitude  = $solAnomoly + 0.0334405 * sin($solAnomoly);
         $solLongitude += 4.93289 + 3.49066E-4 * sin(2 * $solAnomoly);
 
         // get quadrant
         $solLongitude = $this->_range($solLongitude, $fullCircle);
 
         if (($solLongitude / $quarterCircle) - intval($solLongitude / $quarterCircle) == 0) {
             $solLongitude += 4.84814E-6;
         }
 
         // solar ascension
         $solAscension = sin($solLongitude) / cos($solLongitude);
         $solAscension = atan2(0.91746 * $solAscension, 1);
 
         // adjust quadrant
         if ($solLongitude > $threeQuarterCircle) {
             $solAscension += $fullCircle;
         } else if ($solLongitude > $quarterCircle) {
             $solAscension += $halfCircle;
         }
 
         // solar declination
         $solDeclination  = 0.39782 * sin($solLongitude);
         $solDeclination /=  sqrt(-$solDeclination * $solDeclination + 1);
         $solDeclination  = atan2($solDeclination, 1);
 
         $solHorizon = $horizon - sin($solDeclination) * sin($radLatitude);
         $solHorizon /= cos($solDeclination) * cos($radLatitude);
 
         // midnight sun, always night
         if (abs($solHorizon) > 1) {
             return false;
         }
 
         $solHorizon /= sqrt(-$solHorizon * $solHorizon + 1);
         $solHorizon  = $quarterCircle - atan2($solHorizon, 1);
 
         if ($rise) {
             $solHorizon = $fullCircle - $solHorizon;
         }
 
         // time calculation
         $localTime     = $solHorizon + $solAscension - 0.0172028 * $radDay - 1.73364;
         $universalTime = $localTime - $radLongitude;
 
         // determinate quadrant
         $universalTime = $this->_range($universalTime, $fullCircle);
 
         // radiant to hours
         $universalTime *= 24 / $fullCircle;
 
         // convert to time
         $hour = intval($universalTime);
         $universalTime    = ($universalTime - $hour) * 60;
         $min  = intval($universalTime);
         $universalTime    = ($universalTime - $min) * 60;
         $sec  = intval($universalTime);
 
         return $this->mktime($hour, $min, $sec, $this->date('m', $this->_unixTimestamp),
                              $this->date('j', $this->_unixTimestamp), $this->date('Y', $this->_unixTimestamp),
                              -1, true);
     }
 
     /**
      * Sets a new timezone for calculation of $this object's gmt offset.
      * For a list of supported timezones look here: http://php.net/timezones
      * If no timezone can be detected or the given timezone is wrong UTC will be set.
      *
      * @param  string  $zone      OPTIONAL timezone for date calculation; defaults to date_default_timezone_get()
      * @return Zend_Date_DateObject Provides fluent interface
      * @throws Zend_Date_Exception
      */
     public function setTimezone($zone = null)
     {
         $oldzone = @date_default_timezone_get();
         if ($zone === null) {
             $zone = $oldzone;
         }
 
         // throw an error on false input, but only if the new date extension is available
         if (function_exists('timezone_open')) {
             if (!@timezone_open($zone)) {
                 // require_once 'Zend/Date/Exception.php';
                 throw new Zend_Date_Exception("timezone ($zone) is not a known timezone", 0, null, $zone);
             }
         }
         // this can generate an error if the date extension is not available and a false timezone is given
         $result = @date_default_timezone_set($zone);
         if ($result === true) {
             $this->_offset   = mktime(0, 0, 0, 1, 2, 1970) - gmmktime(0, 0, 0, 1, 2, 1970);
             $this->_timezone = $zone;
         }
         date_default_timezone_set($oldzone);
 
         if (($zone == 'UTC') or ($zone == 'GMT')) {
             $this->_dst = false;
         } else {
             $this->_dst = true;
         }
 
         return $this;
     }
 
     /**
      * Return the timezone of $this object.
      * The timezone is initially set when the object is instantiated.
      *
      * @return  string  actual set timezone string
      */
     public function getTimezone()
     {
         return $this->_timezone;
     }
 
     /**
      * Return the offset to GMT of $this object's timezone.
      * The offset to GMT is initially set when the object is instantiated using the currently,
      * in effect, default timezone for PHP functions.
      *
      * @return  integer  seconds difference between GMT timezone and timezone when object was instantiated
      */
     public function getGmtOffset()
     {
         $date   = $this->getDateParts($this->getUnixTimestamp(), true);
         $zone   = @date_default_timezone_get();
         $result = @date_default_timezone_set($this->_timezone);
         if ($result === true) {
             $offset = $this->mktime($date['hours'], $date['minutes'], $date['seconds'],
                                     $date['mon'], $date['mday'], $date['year'], false)
                     - $this->mktime($date['hours'], $date['minutes'], $date['seconds'],
                                     $date['mon'], $date['mday'], $date['year'], true);
         }
         date_default_timezone_set($zone);
 
         return $offset;
     }
 
     /**
      * Internal method to check if the given cache supports tags
      *
      * @param Zend_Cache $cache
      */
     protected static function _getTagSupportForCache()
     {
         $backend = self::$_cache->getBackend();
         if ($backend instanceof Zend_Cache_Backend_ExtendedInterface) {
             $cacheOptions = $backend->getCapabilities();
             self::$_cacheTags = $cacheOptions['tags'];
         } else {
             self::$_cacheTags = false;
         }
 
         return self::$_cacheTags;
     }
 }